For the pulse based manasong you should not have to stop it. If you leave it run you will get a shot of mana every pulse. However you should also be able to stop it and restart it to get faster pulses.
So repeating the song after each pulse should get you a manashot every 3ish sec(song cast time). Whereas letting it run on its own will get you a manashot every tick approx.
There should be no icon for anyone on the pulse based manasong.
For charm I have less knowledge as it was not often used back then, you should be able to continue the song and keep a mob charmed with the manaless version. The charm that requires mana should have to wear off first though IIRC.
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